In unserem Haus steht eine Wärmepumpe des Typs CTA Optiheat 1-11es.
Da wir in der letzten Zeit mit der Temperatur des heissen Trinkwassers nicht zufrieden waren, habe ich mich der Herausforderung gestellt, an Metrikdaten zu kommen.
Recently I got an new exception when I started a Spring Boot application for development:
Fatal error: java.lang.NullPointerException: Cannot invoke "jdk.internal.platform.CgroupInfo.getMountPoint()" because "anyController" is null
at java.base/jdk.internal.platform.cgroupv2.CgroupV2Subsystem.getInstance(CgroupV2Subsystem.java:80)
at java.base/jdk.internal.platform.CgroupSubsystemFactory.create(CgroupSubsystemFactory.java:114)
at java.base/jdk.internal.platform.CgroupMetrics.getInstance(CgroupMetrics.java:177)
at java.base/jdk.internal.platform.SystemMetrics.instance(SystemMetrics.java:29)
at java.base/jdk.internal.platform.Metrics.systemMetrics(Metrics.java:58)
at java.base/jdk.internal.platform.Container.metrics(Container.java:43)
at jdk.management/com.sun.management.internal.OperatingSystemImpl.<init (OperatingSystemImpl.java:182)
I currently use bash/zsh aliases to simplify setting up tunnels to our database servers.
In an article in the Linux Magazin I read about boring.
The tool looked nice as it allows a well readable config file and opening the tunnels in the background.
As boring (or rather its ssh_config library) does not support Match in the ssh config, it is no real solution for me.
Luckily I read ssh itself can do the job quite well without 3rd party tool!
evcc does not provide an metric endpoint for prometheus (see evcc discussion #7306).
With pollect, its easy to publish the evcc data for prometheus.
With my former Yubikeys I was used to use yubikey-oath-dmenu for (T)OTP.
As I found no similar solution for Token2, I wrote a wrapper script around t2-cli.
I recently started to use Token2 "T2F2-PIN+ Release3 TypeC" Keys to store SSH Keys use them for (T)OTP and U2F/FIDO2.
But GnuPG did not work out of the box on my Arch Linux notebook.
To enhance the restore speed for PostgreSQL databases, the pg_restore command running the most time-consumping steps concurrently by providing the number of jobs with -j/--jobs.
Unfortunately the parallel restore can fail when restoring foreign keys due to not yet restored tables:
pg_restore: error: could not execute query: ERROR: there is no unique constraint matching given keys for referenced table "page"
Command was: ALTER TABLE ONLY pagecontent
ADD CONSTRAINT "$1" FOREIGN KEY (page_id) REFERENCES page(id);
Configuring and using a local Yubikey for SSH with FIDO2 is very straight forward using the Yubico manual Securing SSH with FIDO2
But in some cases I would like to use my Yubikey based SSH key on my office's workstation when I am at home using my notebook.
The expiring Let’s Encrypt DST Root CA X3 can cause problems on old servers:
root@server:/etc# wget https://www.example.com/monitoring --2021-09-30 21:34:39-- https://www.example.com/monitoring Resolving www.example.com (www.example.com)... 93.184.216.34 Connecting to www.example.com (www.example.com)|93.184.216.34|:443... connected. ERROR: The certificate of `www.example.com' is not trusted.
Fortunately there is an easy workaround to ensure the expired chain is not checked.
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